linux-arts: Add SPDX headers to build and run scripts

Add SPDX headers and origin to build and run scripts.
diff --git a/syzkaller-repros/build.sh b/syzkaller-repros/build.sh
index 6d2d805..a00603e 100755
--- a/syzkaller-repros/build.sh
+++ b/syzkaller-repros/build.sh
@@ -1,3 +1,7 @@
+#!/bin/bash
+#
+# SPDX-License-Identifier: GPL-2.0
+# Origin: https://github.com/google/syzkaller
 mkdir -p bin
 for f in linux/*.c; do
 	out="bin/`basename "$f" .c`"
diff --git a/syzkaller-repros/run.sh b/syzkaller-repros/run.sh
index cce6a6f..66af796 100755
--- a/syzkaller-repros/run.sh
+++ b/syzkaller-repros/run.sh
@@ -1,3 +1,7 @@
+#!/bin/bash
+#
+# SPDX-License-Identifier: GPL-2.0
+# Origin: https://github.com/google/syzkaller
 set -x
 for f in *; do
 	bin="`pwd`/$f"